Both sides will be keen to progress to the quarter-finals of the historic competition with Sarri under immense pressure and United coming into the game on the back of a 2-0 defeat to Paris Saint-Germain.

Alexis Sanchez is likely to feature in the most talked about tie of the fifth round, with the Chilean international struggling to assert himself under Ole Gunnar Solskjaer.

United’s official account tweeted out a link to a chat with Sanchez, which focused on his collision with an assistant referee during the PSG fixture.

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One Twitter user even slammed Sanchez by saying: “He shouldn't be our No 7.”

Despite the backlash, some responses where in favour of the 30-year-old, and called on his team-mates to support the forward.

“He's great player just needs some more class around him," wrote one Twitter user.

“He needs confidence and encouragement from his teammates…”

Man Utd fans had a mixed reaction to the tweet (Image: Twitter)

Man Utd’s Alexis Sanchez could leave the club if his form doesn't improve (Image: GETTY)

The interview itself explained the incident from Tuesday in which Sanchez clashed with the linesman whilst taking part in a warm-up.

“Before coming on in the game against PSG, I was warming up on the touchline and I always warm up on the other side because, as a rule, there aren’t any assistant referees on that side," Sanchez told MUTV.

”At one point, I was warming up, stretching out my leg and watching the game at the same time. We had a quick breakaway and the linesman was coming from here and, suddenly, I looked up and bang!”

Sanchez will look to score just his third goal of the season this evening - but he did grab the opener last time out in the FA Cup against his former club Arsenal.